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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2008 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.net;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import com.google.common.annotations.Beta;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import com.google.common.base.Objects;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import com.google.common.base.Preconditions;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import com.google.common.hash.Hashing;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import com.google.common.io.ByteStreams;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import com.google.common.primitives.Ints;<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.net.Inet4Address;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.net.Inet6Address;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.net.InetAddress;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.net.UnknownHostException;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.nio.ByteBuffer;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.util.Arrays;<a name="line.31"></a>
<span class="sourceLineNo">032</span><a name="line.32"></a>
<span class="sourceLineNo">033</span>import javax.annotation.Nullable;<a name="line.33"></a>
<span class="sourceLineNo">034</span><a name="line.34"></a>
<span class="sourceLineNo">035</span>/**<a name="line.35"></a>
<span class="sourceLineNo">036</span> * Static utility methods pertaining to {@link InetAddress} instances.<a name="line.36"></a>
<span class="sourceLineNo">037</span> *<a name="line.37"></a>
<span class="sourceLineNo">038</span> * &lt;p&gt;&lt;b&gt;Important note:&lt;/b&gt; Unlike {@code InetAddress.getByName()}, the<a name="line.38"></a>
<span class="sourceLineNo">039</span> * methods of this class never cause DNS services to be accessed. For<a name="line.39"></a>
<span class="sourceLineNo">040</span> * this reason, you should prefer these methods as much as possible over<a name="line.40"></a>
<span class="sourceLineNo">041</span> * their JDK equivalents whenever you are expecting to handle only<a name="line.41"></a>
<span class="sourceLineNo">042</span> * IP address string literals -- there is no blocking DNS penalty for a<a name="line.42"></a>
<span class="sourceLineNo">043</span> * malformed string.<a name="line.43"></a>
<span class="sourceLineNo">044</span> *<a name="line.44"></a>
<span class="sourceLineNo">045</span> * &lt;p&gt;When dealing with {@link Inet4Address} and {@link Inet6Address}<a name="line.45"></a>
<span class="sourceLineNo">046</span> * objects as byte arrays (vis. {@code InetAddress.getAddress()}) they<a name="line.46"></a>
<span class="sourceLineNo">047</span> * are 4 and 16 bytes in length, respectively, and represent the address<a name="line.47"></a>
<span class="sourceLineNo">048</span> * in network byte order.<a name="line.48"></a>
<span class="sourceLineNo">049</span> *<a name="line.49"></a>
<span class="sourceLineNo">050</span> * &lt;p&gt;Examples of IP addresses and their byte representations:<a name="line.50"></a>
<span class="sourceLineNo">051</span> * &lt;ul&gt;<a name="line.51"></a>
<span class="sourceLineNo">052</span> * &lt;li&gt;The IPv4 loopback address, {@code "127.0.0.1"}.&lt;br/&gt;<a name="line.52"></a>
<span class="sourceLineNo">053</span> *     {@code 7f 00 00 01}<a name="line.53"></a>
<span class="sourceLineNo">054</span> *<a name="line.54"></a>
<span class="sourceLineNo">055</span> * &lt;li&gt;The IPv6 loopback address, {@code "::1"}.&lt;br/&gt;<a name="line.55"></a>
<span class="sourceLineNo">056</span> *     {@code 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01}<a name="line.56"></a>
<span class="sourceLineNo">057</span> *<a name="line.57"></a>
<span class="sourceLineNo">058</span> * &lt;li&gt;From the IPv6 reserved documentation prefix ({@code 2001:db8::/32}),<a name="line.58"></a>
<span class="sourceLineNo">059</span> *     {@code "2001:db8::1"}.&lt;br/&gt;<a name="line.59"></a>
<span class="sourceLineNo">060</span> *     {@code 20 01 0d b8 00 00 00 00 00 00 00 00 00 00 00 01}<a name="line.60"></a>
<span class="sourceLineNo">061</span> *<a name="line.61"></a>
<span class="sourceLineNo">062</span> * &lt;li&gt;An IPv6 "IPv4 compatible" (or "compat") address,<a name="line.62"></a>
<span class="sourceLineNo">063</span> *     {@code "::192.168.0.1"}.&lt;br/&gt;<a name="line.63"></a>
<span class="sourceLineNo">064</span> *     {@code 00 00 00 00 00 00 00 00 00 00 00 00 c0 a8 00 01}<a name="line.64"></a>
<span class="sourceLineNo">065</span> *<a name="line.65"></a>
<span class="sourceLineNo">066</span> * &lt;li&gt;An IPv6 "IPv4 mapped" address, {@code "::ffff:192.168.0.1"}.&lt;br/&gt;<a name="line.66"></a>
<span class="sourceLineNo">067</span> *     {@code 00 00 00 00 00 00 00 00 00 00 ff ff c0 a8 00 01}<a name="line.67"></a>
<span class="sourceLineNo">068</span> * &lt;/ul&gt;<a name="line.68"></a>
<span class="sourceLineNo">069</span> *<a name="line.69"></a>
<span class="sourceLineNo">070</span> * &lt;p&gt;A few notes about IPv6 "IPv4 mapped" addresses and their observed<a name="line.70"></a>
<span class="sourceLineNo">071</span> * use in Java.<a name="line.71"></a>
<span class="sourceLineNo">072</span> * &lt;br&gt;&lt;br&gt;<a name="line.72"></a>
<span class="sourceLineNo">073</span> * "IPv4 mapped" addresses were originally a representation of IPv4<a name="line.73"></a>
<span class="sourceLineNo">074</span> * addresses for use on an IPv6 socket that could receive both IPv4<a name="line.74"></a>
<span class="sourceLineNo">075</span> * and IPv6 connections (by disabling the {@code IPV6_V6ONLY} socket<a name="line.75"></a>
<span class="sourceLineNo">076</span> * option on an IPv6 socket).  Yes, it's confusing.  Nevertheless,<a name="line.76"></a>
<span class="sourceLineNo">077</span> * these "mapped" addresses were never supposed to be seen on the<a name="line.77"></a>
<span class="sourceLineNo">078</span> * wire.  That assumption was dropped, some say mistakenly, in later<a name="line.78"></a>
<span class="sourceLineNo">079</span> * RFCs with the apparent aim of making IPv4-to-IPv6 transition simpler.<a name="line.79"></a>
<span class="sourceLineNo">080</span> *<a name="line.80"></a>
<span class="sourceLineNo">081</span> * &lt;p&gt;Technically one &lt;i&gt;can&lt;/i&gt; create a 128bit IPv6 address with the wire<a name="line.81"></a>
<span class="sourceLineNo">082</span> * format of a "mapped" address, as shown above, and transmit it in an<a name="line.82"></a>
<span class="sourceLineNo">083</span> * IPv6 packet header.  However, Java's InetAddress creation methods<a name="line.83"></a>
<span class="sourceLineNo">084</span> * appear to adhere doggedly to the original intent of the "mapped"<a name="line.84"></a>
<span class="sourceLineNo">085</span> * address: all "mapped" addresses return {@link Inet4Address} objects.<a name="line.85"></a>
<span class="sourceLineNo">086</span> *<a name="line.86"></a>
<span class="sourceLineNo">087</span> * &lt;p&gt;For added safety, it is common for IPv6 network operators to filter<a name="line.87"></a>
<span class="sourceLineNo">088</span> * all packets where either the source or destination address appears to<a name="line.88"></a>
<span class="sourceLineNo">089</span> * be a "compat" or "mapped" address.  Filtering suggestions usually<a name="line.89"></a>
<span class="sourceLineNo">090</span> * recommend discarding any packets with source or destination addresses<a name="line.90"></a>
<span class="sourceLineNo">091</span> * in the invalid range {@code ::/3}, which includes both of these bizarre<a name="line.91"></a>
<span class="sourceLineNo">092</span> * address formats.  For more information on "bogons", including lists<a name="line.92"></a>
<span class="sourceLineNo">093</span> * of IPv6 bogon space, see:<a name="line.93"></a>
<span class="sourceLineNo">094</span> *<a name="line.94"></a>
<span class="sourceLineNo">095</span> * &lt;ul&gt;<a name="line.95"></a>
<span class="sourceLineNo">096</span> * &lt;li&gt;&lt;a target="_parent"<a name="line.96"></a>
<span class="sourceLineNo">097</span> *        href="http://en.wikipedia.org/wiki/Bogon_filtering"<a name="line.97"></a>
<span class="sourceLineNo">098</span> *       &gt;http://en.wikipedia.org/wiki/Bogon_filtering&lt;/a&gt;<a name="line.98"></a>
<span class="sourceLineNo">099</span> * &lt;li&gt;&lt;a target="_parent"<a name="line.99"></a>
<span class="sourceLineNo">100</span> *        href="http://www.cymru.com/Bogons/ipv6.txt"<a name="line.100"></a>
<span class="sourceLineNo">101</span> *       &gt;http://www.cymru.com/Bogons/ipv6.txt&lt;/a&gt;<a name="line.101"></a>
<span class="sourceLineNo">102</span> * &lt;li&gt;&lt;a target="_parent"<a name="line.102"></a>
<span class="sourceLineNo">103</span> *        href="http://www.cymru.com/Bogons/v6bogon.html"<a name="line.103"></a>
<span class="sourceLineNo">104</span> *       &gt;http://www.cymru.com/Bogons/v6bogon.html&lt;/a&gt;<a name="line.104"></a>
<span class="sourceLineNo">105</span> * &lt;li&gt;&lt;a target="_parent"<a name="line.105"></a>
<span class="sourceLineNo">106</span> *        href="http://www.space.net/~gert/RIPE/ipv6-filters.html"<a name="line.106"></a>
<span class="sourceLineNo">107</span> *       &gt;http://www.space.net/~gert/RIPE/ipv6-filters.html&lt;/a&gt;<a name="line.107"></a>
<span class="sourceLineNo">108</span> * &lt;/ul&gt;<a name="line.108"></a>
<span class="sourceLineNo">109</span> *<a name="line.109"></a>
<span class="sourceLineNo">110</span> * @author Erik Kline<a name="line.110"></a>
<span class="sourceLineNo">111</span> * @since 5.0<a name="line.111"></a>
<span class="sourceLineNo">112</span> */<a name="line.112"></a>
<span class="sourceLineNo">113</span>@Beta<a name="line.113"></a>
<span class="sourceLineNo">114</span>public final class InetAddresses {<a name="line.114"></a>
<span class="sourceLineNo">115</span>  private static final int IPV4_PART_COUNT = 4;<a name="line.115"></a>
<span class="sourceLineNo">116</span>  private static final int IPV6_PART_COUNT = 8;<a name="line.116"></a>
<span class="sourceLineNo">117</span>  private static final Inet4Address LOOPBACK4 = (Inet4Address) forString("127.0.0.1");<a name="line.117"></a>
<span class="sourceLineNo">118</span>  private static final Inet4Address ANY4 = (Inet4Address) forString("0.0.0.0");<a name="line.118"></a>
<span class="sourceLineNo">119</span><a name="line.119"></a>
<span class="sourceLineNo">120</span>  private InetAddresses() {}<a name="line.120"></a>
<span class="sourceLineNo">121</span><a name="line.121"></a>
<span class="sourceLineNo">122</span>  /**<a name="line.122"></a>
<span class="sourceLineNo">123</span>   * Returns an {@link Inet4Address}, given a byte array representation of the IPv4 address.<a name="line.123"></a>
<span class="sourceLineNo">124</span>   *<a name="line.124"></a>
<span class="sourceLineNo">125</span>   * @param bytes byte array representing an IPv4 address (should be of length 4)<a name="line.125"></a>
<span class="sourceLineNo">126</span>   * @return {@link Inet4Address} corresponding to the supplied byte array<a name="line.126"></a>
<span class="sourceLineNo">127</span>   * @throws IllegalArgumentException if a valid {@link Inet4Address} can not be created<a name="line.127"></a>
<span class="sourceLineNo">128</span>   */<a name="line.128"></a>
<span class="sourceLineNo">129</span>  private static Inet4Address getInet4Address(byte[] bytes) {<a name="line.129"></a>
<span class="sourceLineNo">130</span>    Preconditions.checkArgument(bytes.length == 4,<a name="line.130"></a>
<span class="sourceLineNo">131</span>        "Byte array has invalid length for an IPv4 address: %s != 4.",<a name="line.131"></a>
<span class="sourceLineNo">132</span>        bytes.length);<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span>    // Given a 4-byte array, this cast should always succeed.<a name="line.134"></a>
<span class="sourceLineNo">135</span>    return (Inet4Address) bytesToInetAddress(bytes);<a name="line.135"></a>
<span class="sourceLineNo">136</span>  }<a name="line.136"></a>
<span class="sourceLineNo">137</span><a name="line.137"></a>
<span class="sourceLineNo">138</span>  /**<a name="line.138"></a>
<span class="sourceLineNo">139</span>   * Returns the {@link InetAddress} having the given string representation.<a name="line.139"></a>
<span class="sourceLineNo">140</span>   *<a name="line.140"></a>
<span class="sourceLineNo">141</span>   * &lt;p&gt;This deliberately avoids all nameservice lookups (e.g. no DNS).<a name="line.141"></a>
<span class="sourceLineNo">142</span>   *<a name="line.142"></a>
<span class="sourceLineNo">143</span>   * @param ipString {@code String} containing an IPv4 or IPv6 string literal, e.g.<a name="line.143"></a>
<span class="sourceLineNo">144</span>   *     {@code "192.168.0.1"} or {@code "2001:db8::1"}<a name="line.144"></a>
<span class="sourceLineNo">145</span>   * @return {@link InetAddress} representing the argument<a name="line.145"></a>
<span class="sourceLineNo">146</span>   * @throws IllegalArgumentException if the argument is not a valid IP string literal<a name="line.146"></a>
<span class="sourceLineNo">147</span>   */<a name="line.147"></a>
<span class="sourceLineNo">148</span>  public static InetAddress forString(String ipString) {<a name="line.148"></a>
<span class="sourceLineNo">149</span>    byte[] addr = ipStringToBytes(ipString);<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span>    // The argument was malformed, i.e. not an IP string literal.<a name="line.151"></a>
<span class="sourceLineNo">152</span>    if (addr == null) {<a name="line.152"></a>
<span class="sourceLineNo">153</span>      throw new IllegalArgumentException(<a name="line.153"></a>
<span class="sourceLineNo">154</span>          String.format("'%s' is not an IP string literal.", ipString));<a name="line.154"></a>
<span class="sourceLineNo">155</span>    }<a name="line.155"></a>
<span class="sourceLineNo">156</span><a name="line.156"></a>
<span class="sourceLineNo">157</span>    return bytesToInetAddress(addr);<a name="line.157"></a>
<span class="sourceLineNo">158</span>  }<a name="line.158"></a>
<span class="sourceLineNo">159</span><a name="line.159"></a>
<span class="sourceLineNo">160</span>  /**<a name="line.160"></a>
<span class="sourceLineNo">161</span>   * Returns {@code true} if the supplied string is a valid IP string<a name="line.161"></a>
<span class="sourceLineNo">162</span>   * literal, {@code false} otherwise.<a name="line.162"></a>
<span class="sourceLineNo">163</span>   *<a name="line.163"></a>
<span class="sourceLineNo">164</span>   * @param ipString {@code String} to evaluated as an IP string literal<a name="line.164"></a>
<span class="sourceLineNo">165</span>   * @return {@code true} if the argument is a valid IP string literal<a name="line.165"></a>
<span class="sourceLineNo">166</span>   */<a name="line.166"></a>
<span class="sourceLineNo">167</span>  public static boolean isInetAddress(String ipString) {<a name="line.167"></a>
<span class="sourceLineNo">168</span>    return ipStringToBytes(ipString) != null;<a name="line.168"></a>
<span class="sourceLineNo">169</span>  }<a name="line.169"></a>
<span class="sourceLineNo">170</span><a name="line.170"></a>
<span class="sourceLineNo">171</span>  private static byte[] ipStringToBytes(String ipString) {<a name="line.171"></a>
<span class="sourceLineNo">172</span>    // Make a first pass to categorize the characters in this string.<a name="line.172"></a>
<span class="sourceLineNo">173</span>    boolean hasColon = false;<a name="line.173"></a>
<span class="sourceLineNo">174</span>    boolean hasDot = false;<a name="line.174"></a>
<span class="sourceLineNo">175</span>    for (int i = 0; i &lt; ipString.length(); i++) {<a name="line.175"></a>
<span class="sourceLineNo">176</span>      char c = ipString.charAt(i);<a name="line.176"></a>
<span class="sourceLineNo">177</span>      if (c == '.') {<a name="line.177"></a>
<span class="sourceLineNo">178</span>        hasDot = true;<a name="line.178"></a>
<span class="sourceLineNo">179</span>      } else if (c == ':') {<a name="line.179"></a>
<span class="sourceLineNo">180</span>        if (hasDot) {<a name="line.180"></a>
<span class="sourceLineNo">181</span>          return null;  // Colons must not appear after dots.<a name="line.181"></a>
<span class="sourceLineNo">182</span>        }<a name="line.182"></a>
<span class="sourceLineNo">183</span>        hasColon = true;<a name="line.183"></a>
<span class="sourceLineNo">184</span>      } else if (Character.digit(c, 16) == -1) {<a name="line.184"></a>
<span class="sourceLineNo">185</span>        return null;  // Everything else must be a decimal or hex digit.<a name="line.185"></a>
<span class="sourceLineNo">186</span>      }<a name="line.186"></a>
<span class="sourceLineNo">187</span>    }<a name="line.187"></a>
<span class="sourceLineNo">188</span><a name="line.188"></a>
<span class="sourceLineNo">189</span>    // Now decide which address family to parse.<a name="line.189"></a>
<span class="sourceLineNo">190</span>    if (hasColon) {<a name="line.190"></a>
<span class="sourceLineNo">191</span>      if (hasDot) {<a name="line.191"></a>
<span class="sourceLineNo">192</span>        ipString = convertDottedQuadToHex(ipString);<a name="line.192"></a>
<span class="sourceLineNo">193</span>        if (ipString == null) {<a name="line.193"></a>
<span class="sourceLineNo">194</span>          return null;<a name="line.194"></a>
<span class="sourceLineNo">195</span>        }<a name="line.195"></a>
<span class="sourceLineNo">196</span>      }<a name="line.196"></a>
<span class="sourceLineNo">197</span>      return textToNumericFormatV6(ipString);<a name="line.197"></a>
<span class="sourceLineNo">198</span>    } else if (hasDot) {<a name="line.198"></a>
<span class="sourceLineNo">199</span>      return textToNumericFormatV4(ipString);<a name="line.199"></a>
<span class="sourceLineNo">200</span>    }<a name="line.200"></a>
<span class="sourceLineNo">201</span>    return null;<a name="line.201"></a>
<span class="sourceLineNo">202</span>  }<a name="line.202"></a>
<span class="sourceLineNo">203</span><a name="line.203"></a>
<span class="sourceLineNo">204</span>  private static byte[] textToNumericFormatV4(String ipString) {<a name="line.204"></a>
<span class="sourceLineNo">205</span>    String[] address = ipString.split("\\.", IPV4_PART_COUNT + 1);<a name="line.205"></a>
<span class="sourceLineNo">206</span>    if (address.length != IPV4_PART_COUNT) {<a name="line.206"></a>
<span class="sourceLineNo">207</span>      return null;<a name="line.207"></a>
<span class="sourceLineNo">208</span>    }<a name="line.208"></a>
<span class="sourceLineNo">209</span><a name="line.209"></a>
<span class="sourceLineNo">210</span>    byte[] bytes = new byte[IPV4_PART_COUNT];<a name="line.210"></a>
<span class="sourceLineNo">211</span>    try {<a name="line.211"></a>
<span class="sourceLineNo">212</span>      for (int i = 0; i &lt; bytes.length; i++) {<a name="line.212"></a>
<span class="sourceLineNo">213</span>        bytes[i] = parseOctet(address[i]);<a name="line.213"></a>
<span class="sourceLineNo">214</span>      }<a name="line.214"></a>
<span class="sourceLineNo">215</span>    } catch (NumberFormatException ex) {<a name="line.215"></a>
<span class="sourceLineNo">216</span>      return null;<a name="line.216"></a>
<span class="sourceLineNo">217</span>    }<a name="line.217"></a>
<span class="sourceLineNo">218</span><a name="line.218"></a>
<span class="sourceLineNo">219</span>    return bytes;<a name="line.219"></a>
<span class="sourceLineNo">220</span>  }<a name="line.220"></a>
<span class="sourceLineNo">221</span><a name="line.221"></a>
<span class="sourceLineNo">222</span>  private static byte[] textToNumericFormatV6(String ipString) {<a name="line.222"></a>
<span class="sourceLineNo">223</span>    // An address can have [2..8] colons, and N colons make N+1 parts.<a name="line.223"></a>
<span class="sourceLineNo">224</span>    String[] parts = ipString.split(":", IPV6_PART_COUNT + 2);<a name="line.224"></a>
<span class="sourceLineNo">225</span>    if (parts.length &lt; 3 || parts.length &gt; IPV6_PART_COUNT + 1) {<a name="line.225"></a>
<span class="sourceLineNo">226</span>      return null;<a name="line.226"></a>
<span class="sourceLineNo">227</span>    }<a name="line.227"></a>
<span class="sourceLineNo">228</span><a name="line.228"></a>
<span class="sourceLineNo">229</span>    // Disregarding the endpoints, find "::" with nothing in between.<a name="line.229"></a>
<span class="sourceLineNo">230</span>    // This indicates that a run of zeroes has been skipped.<a name="line.230"></a>
<span class="sourceLineNo">231</span>    int skipIndex = -1;<a name="line.231"></a>
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<span class="sourceLineNo">317</span><a name="line.317"></a>
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<span class="sourceLineNo">320</span>   *<a name="line.320"></a>
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<span class="sourceLineNo">322</span>   * exception "if IP address if of illegal length."  We replace it with<a name="line.322"></a>
<span class="sourceLineNo">323</span>   * an unchecked exception, for use by callers who already know that addr<a name="line.323"></a>
<span class="sourceLineNo">324</span>   * is an array of length 4 or 16.<a name="line.324"></a>
<span class="sourceLineNo">325</span>   *<a name="line.325"></a>
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<span class="sourceLineNo">338</span>   * Returns the string representation of an {@link InetAddress}.<a name="line.338"></a>
<span class="sourceLineNo">339</span>   *<a name="line.339"></a>
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<span class="sourceLineNo">341</span>   * {@link InetAddress#getHostAddress()}, but for IPv6 addresses, the output<a name="line.341"></a>
<span class="sourceLineNo">342</span>   * follows &lt;a href="http://tools.ietf.org/html/rfc5952"&gt;RFC 5952&lt;/a&gt;<a name="line.342"></a>
<span class="sourceLineNo">343</span>   * section 4.  The main difference is that this method uses "::" for zero<a name="line.343"></a>
<span class="sourceLineNo">344</span>   * compression, while Java's version uses the uncompressed form.<a name="line.344"></a>
<span class="sourceLineNo">345</span>   *<a name="line.345"></a>
<span class="sourceLineNo">346</span>   * &lt;p&gt;This method uses hexadecimal for all IPv6 addresses, including<a name="line.346"></a>
<span class="sourceLineNo">347</span>   * IPv4-mapped IPv6 addresses such as "::c000:201".  The output does not<a name="line.347"></a>
<span class="sourceLineNo">348</span>   * include a Scope ID.<a name="line.348"></a>
<span class="sourceLineNo">349</span>   *<a name="line.349"></a>
<span class="sourceLineNo">350</span>   * @param ip {@link InetAddress} to be converted to an address string<a name="line.350"></a>
<span class="sourceLineNo">351</span>   * @return {@code String} containing the text-formatted IP address<a name="line.351"></a>
<span class="sourceLineNo">352</span>   * @since 10.0<a name="line.352"></a>
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<span class="sourceLineNo">371</span>  /**<a name="line.371"></a>
<span class="sourceLineNo">372</span>   * Identify and mark the longest run of zeroes in an IPv6 address.<a name="line.372"></a>
<span class="sourceLineNo">373</span>   *<a name="line.373"></a>
<span class="sourceLineNo">374</span>   * &lt;p&gt;Only runs of two or more hextets are considered.  In case of a tie, the<a name="line.374"></a>
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<span class="sourceLineNo">376</span>   * by the sentinel value -1.<a name="line.376"></a>
<span class="sourceLineNo">377</span>   *<a name="line.377"></a>
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<span class="sourceLineNo">402</span><a name="line.402"></a>
<span class="sourceLineNo">403</span>  /**<a name="line.403"></a>
<span class="sourceLineNo">404</span>   * Convert a list of hextets into a human-readable IPv6 address.<a name="line.404"></a>
<span class="sourceLineNo">405</span>   *<a name="line.405"></a>
<span class="sourceLineNo">406</span>   * &lt;p&gt;In order for "::" compression to work, the input should contain negative<a name="line.406"></a>
<span class="sourceLineNo">407</span>   * sentinel values in place of the elided zeroes.<a name="line.407"></a>
<span class="sourceLineNo">408</span>   *<a name="line.408"></a>
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<span class="sourceLineNo">413</span>     * While scanning the array, handle these state transitions:<a name="line.413"></a>
<span class="sourceLineNo">414</span>     *   start-&gt;num =&gt; "num"     start-&gt;gap =&gt; "::"<a name="line.414"></a>
<span class="sourceLineNo">415</span>     *   num-&gt;num   =&gt; ":num"    num-&gt;gap   =&gt; "::"<a name="line.415"></a>
<span class="sourceLineNo">416</span>     *   gap-&gt;num   =&gt; "num"     gap-&gt;gap   =&gt; ""<a name="line.416"></a>
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<span class="sourceLineNo">438</span>   * Returns the string representation of an {@link InetAddress} suitable<a name="line.438"></a>
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<span class="sourceLineNo">440</span>   *<a name="line.440"></a>
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<span class="sourceLineNo">445</span>   *<a name="line.445"></a>
<span class="sourceLineNo">446</span>   * &lt;p&gt;Per section 3.2.2 of<a name="line.446"></a>
<span class="sourceLineNo">447</span>   * &lt;a target="_parent"<a name="line.447"></a>
<span class="sourceLineNo">448</span>   *    href="http://tools.ietf.org/html/rfc3986#section-3.2.2"<a name="line.448"></a>
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<span class="sourceLineNo">451</span>   * {@code "http://[2001:db8::1]:8888/index.html"}.<a name="line.451"></a>
<span class="sourceLineNo">452</span>   *<a name="line.452"></a>
<span class="sourceLineNo">453</span>   * &lt;p&gt;Use of either {@link InetAddresses#toAddrString},<a name="line.453"></a>
<span class="sourceLineNo">454</span>   * {@link InetAddress#getHostAddress()}, or this method is recommended over<a name="line.454"></a>
<span class="sourceLineNo">455</span>   * {@link InetAddress#toString()} when an IP address string literal is<a name="line.455"></a>
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<span class="sourceLineNo">457</span>   * hostname and the IP address string joined by a "/".<a name="line.457"></a>
<span class="sourceLineNo">458</span>   *<a name="line.458"></a>
<span class="sourceLineNo">459</span>   * @param ip {@link InetAddress} to be converted to URI string literal<a name="line.459"></a>
<span class="sourceLineNo">460</span>   * @return {@code String} containing URI-safe string literal<a name="line.460"></a>
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<span class="sourceLineNo">470</span>   * Returns an InetAddress representing the literal IPv4 or IPv6 host<a name="line.470"></a>
<span class="sourceLineNo">471</span>   * portion of a URL, encoded in the format specified by RFC 3986 section 3.2.2.<a name="line.471"></a>
<span class="sourceLineNo">472</span>   *<a name="line.472"></a>
<span class="sourceLineNo">473</span>   * &lt;p&gt;This function is similar to {@link InetAddresses#forString(String)},<a name="line.473"></a>
<span class="sourceLineNo">474</span>   * however, it requires that IPv6 addresses are surrounded by square brackets.<a name="line.474"></a>
<span class="sourceLineNo">475</span>   *<a name="line.475"></a>
<span class="sourceLineNo">476</span>   * &lt;p&gt;This function is the inverse of<a name="line.476"></a>
<span class="sourceLineNo">477</span>   * {@link InetAddresses#toUriString(java.net.InetAddress)}.<a name="line.477"></a>
<span class="sourceLineNo">478</span>   *<a name="line.478"></a>
<span class="sourceLineNo">479</span>   * @param hostAddr A RFC 3986 section 3.2.2 encoded IPv4 or IPv6 address<a name="line.479"></a>
<span class="sourceLineNo">480</span>   * @return an InetAddress representing the address in {@code hostAddr}<a name="line.480"></a>
<span class="sourceLineNo">481</span>   * @throws IllegalArgumentException if {@code hostAddr} is not a valid<a name="line.481"></a>
<span class="sourceLineNo">482</span>   *     IPv4 address, or IPv6 address surrounded by square brackets<a name="line.482"></a>
<span class="sourceLineNo">483</span>   */<a name="line.483"></a>
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<span class="sourceLineNo">485</span>    Preconditions.checkNotNull(hostAddr);<a name="line.485"></a>
<span class="sourceLineNo">486</span><a name="line.486"></a>
<span class="sourceLineNo">487</span>    // Decide if this should be an IPv6 or IPv4 address.<a name="line.487"></a>
<span class="sourceLineNo">488</span>    String ipString;<a name="line.488"></a>
<span class="sourceLineNo">489</span>    int expectBytes;<a name="line.489"></a>
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<span class="sourceLineNo">492</span>      expectBytes = 16;<a name="line.492"></a>
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<span class="sourceLineNo">497</span><a name="line.497"></a>
<span class="sourceLineNo">498</span>    // Parse the address, and make sure the length/version is correct.<a name="line.498"></a>
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<span class="sourceLineNo">502</span>          String.format("Not a valid URI IP literal: '%s'", hostAddr));<a name="line.502"></a>
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<span class="sourceLineNo">504</span><a name="line.504"></a>
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<span class="sourceLineNo">509</span>   * Returns {@code true} if the supplied string is a valid URI IP string<a name="line.509"></a>
<span class="sourceLineNo">510</span>   * literal, {@code false} otherwise.<a name="line.510"></a>
<span class="sourceLineNo">511</span>   *<a name="line.511"></a>
<span class="sourceLineNo">512</span>   * @param ipString {@code String} to evaluated as an IP URI host string literal<a name="line.512"></a>
<span class="sourceLineNo">513</span>   * @return {@code true} if the argument is a valid IP URI host<a name="line.513"></a>
<span class="sourceLineNo">514</span>   */<a name="line.514"></a>
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<span class="sourceLineNo">516</span>    try {<a name="line.516"></a>
<span class="sourceLineNo">517</span>      forUriString(ipString);<a name="line.517"></a>
<span class="sourceLineNo">518</span>      return true;<a name="line.518"></a>
<span class="sourceLineNo">519</span>    } catch (IllegalArgumentException e) {<a name="line.519"></a>
<span class="sourceLineNo">520</span>      return false;<a name="line.520"></a>
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<span class="sourceLineNo">523</span><a name="line.523"></a>
<span class="sourceLineNo">524</span>  /**<a name="line.524"></a>
<span class="sourceLineNo">525</span>   * Evaluates whether the argument is an IPv6 "compat" address.<a name="line.525"></a>
<span class="sourceLineNo">526</span>   *<a name="line.526"></a>
<span class="sourceLineNo">527</span>   * &lt;p&gt;An "IPv4 compatible", or "compat", address is one with 96 leading<a name="line.527"></a>
<span class="sourceLineNo">528</span>   * bits of zero, with the remaining 32 bits interpreted as an<a name="line.528"></a>
<span class="sourceLineNo">529</span>   * IPv4 address.  These are conventionally represented in string<a name="line.529"></a>
<span class="sourceLineNo">530</span>   * literals as {@code "::192.168.0.1"}, though {@code "::c0a8:1"} is<a name="line.530"></a>
<span class="sourceLineNo">531</span>   * also considered an IPv4 compatible address (and equivalent to<a name="line.531"></a>
<span class="sourceLineNo">532</span>   * {@code "::192.168.0.1"}).<a name="line.532"></a>
<span class="sourceLineNo">533</span>   *<a name="line.533"></a>
<span class="sourceLineNo">534</span>   * &lt;p&gt;For more on IPv4 compatible addresses see section 2.5.5.1 of<a name="line.534"></a>
<span class="sourceLineNo">535</span>   * &lt;a target="_parent"<a name="line.535"></a>
<span class="sourceLineNo">536</span>   *    href="http://tools.ietf.org/html/rfc4291#section-2.5.5.1"<a name="line.536"></a>
<span class="sourceLineNo">537</span>   *    &gt;http://tools.ietf.org/html/rfc4291&lt;/a&gt;<a name="line.537"></a>
<span class="sourceLineNo">538</span>   *<a name="line.538"></a>
<span class="sourceLineNo">539</span>   * &lt;p&gt;NOTE: This method is different from<a name="line.539"></a>
<span class="sourceLineNo">540</span>   * {@link Inet6Address#isIPv4CompatibleAddress} in that it more<a name="line.540"></a>
<span class="sourceLineNo">541</span>   * correctly classifies {@code "::"} and {@code "::1"} as<a name="line.541"></a>
<span class="sourceLineNo">542</span>   * proper IPv6 addresses (which they are), NOT IPv4 compatible<a name="line.542"></a>
<span class="sourceLineNo">543</span>   * addresses (which they are generally NOT considered to be).<a name="line.543"></a>
<span class="sourceLineNo">544</span>   *<a name="line.544"></a>
<span class="sourceLineNo">545</span>   * @param ip {@link Inet6Address} to be examined for embedded IPv4 compatible address format<a name="line.545"></a>
<span class="sourceLineNo">546</span>   * @return {@code true} if the argument is a valid "compat" address<a name="line.546"></a>
<span class="sourceLineNo">547</span>   */<a name="line.547"></a>
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<span class="sourceLineNo">552</span><a name="line.552"></a>
<span class="sourceLineNo">553</span>    byte[] bytes = ip.getAddress();<a name="line.553"></a>
<span class="sourceLineNo">554</span>    if ((bytes[12] == 0) &amp;&amp; (bytes[13] == 0) &amp;&amp; (bytes[14] == 0)<a name="line.554"></a>
<span class="sourceLineNo">555</span>        &amp;&amp; ((bytes[15] == 0) || (bytes[15] == 1))) {<a name="line.555"></a>
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<span class="sourceLineNo">558</span><a name="line.558"></a>
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<span class="sourceLineNo">561</span><a name="line.561"></a>
<span class="sourceLineNo">562</span>  /**<a name="line.562"></a>
<span class="sourceLineNo">563</span>   * Returns the IPv4 address embedded in an IPv4 compatible address.<a name="line.563"></a>
<span class="sourceLineNo">564</span>   *<a name="line.564"></a>
<span class="sourceLineNo">565</span>   * @param ip {@link Inet6Address} to be examined for an embedded IPv4 address<a name="line.565"></a>
<span class="sourceLineNo">566</span>   * @return {@link Inet4Address} of the embedded IPv4 address<a name="line.566"></a>
<span class="sourceLineNo">567</span>   * @throws IllegalArgumentException if the argument is not a valid IPv4 compatible address<a name="line.567"></a>
<span class="sourceLineNo">568</span>   */<a name="line.568"></a>
<span class="sourceLineNo">569</span>  public static Inet4Address getCompatIPv4Address(Inet6Address ip) {<a name="line.569"></a>
<span class="sourceLineNo">570</span>    Preconditions.checkArgument(isCompatIPv4Address(ip),<a name="line.570"></a>
<span class="sourceLineNo">571</span>        "Address '%s' is not IPv4-compatible.", toAddrString(ip));<a name="line.571"></a>
<span class="sourceLineNo">572</span><a name="line.572"></a>
<span class="sourceLineNo">573</span>    return getInet4Address(Arrays.copyOfRange(ip.getAddress(), 12, 16));<a name="line.573"></a>
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<span class="sourceLineNo">575</span><a name="line.575"></a>
<span class="sourceLineNo">576</span>  /**<a name="line.576"></a>
<span class="sourceLineNo">577</span>   * Evaluates whether the argument is a 6to4 address.<a name="line.577"></a>
<span class="sourceLineNo">578</span>   *<a name="line.578"></a>
<span class="sourceLineNo">579</span>   * &lt;p&gt;6to4 addresses begin with the {@code "2002::/16"} prefix.<a name="line.579"></a>
<span class="sourceLineNo">580</span>   * The next 32 bits are the IPv4 address of the host to which<a name="line.580"></a>
<span class="sourceLineNo">581</span>   * IPv6-in-IPv4 tunneled packets should be routed.<a name="line.581"></a>
<span class="sourceLineNo">582</span>   *<a name="line.582"></a>
<span class="sourceLineNo">583</span>   * &lt;p&gt;For more on 6to4 addresses see section 2 of<a name="line.583"></a>
<span class="sourceLineNo">584</span>   * &lt;a target="_parent" href="http://tools.ietf.org/html/rfc3056#section-2"<a name="line.584"></a>
<span class="sourceLineNo">585</span>   *    &gt;http://tools.ietf.org/html/rfc3056&lt;/a&gt;<a name="line.585"></a>
<span class="sourceLineNo">586</span>   *<a name="line.586"></a>
<span class="sourceLineNo">587</span>   * @param ip {@link Inet6Address} to be examined for 6to4 address format<a name="line.587"></a>
<span class="sourceLineNo">588</span>   * @return {@code true} if the argument is a 6to4 address<a name="line.588"></a>
<span class="sourceLineNo">589</span>   */<a name="line.589"></a>
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<span class="sourceLineNo">591</span>    byte[] bytes = ip.getAddress();<a name="line.591"></a>
<span class="sourceLineNo">592</span>    return (bytes[0] == (byte) 0x20) &amp;&amp; (bytes[1] == (byte) 0x02);<a name="line.592"></a>
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<span class="sourceLineNo">594</span><a name="line.594"></a>
<span class="sourceLineNo">595</span>  /**<a name="line.595"></a>
<span class="sourceLineNo">596</span>   * Returns the IPv4 address embedded in a 6to4 address.<a name="line.596"></a>
<span class="sourceLineNo">597</span>   *<a name="line.597"></a>
<span class="sourceLineNo">598</span>   * @param ip {@link Inet6Address} to be examined for embedded IPv4 in 6to4 address<a name="line.598"></a>
<span class="sourceLineNo">599</span>   * @return {@link Inet4Address} of embedded IPv4 in 6to4 address<a name="line.599"></a>
<span class="sourceLineNo">600</span>   * @throws IllegalArgumentException if the argument is not a valid IPv6 6to4 address<a name="line.600"></a>
<span class="sourceLineNo">601</span>   */<a name="line.601"></a>
<span class="sourceLineNo">602</span>  public static Inet4Address get6to4IPv4Address(Inet6Address ip) {<a name="line.602"></a>
<span class="sourceLineNo">603</span>    Preconditions.checkArgument(is6to4Address(ip),<a name="line.603"></a>
<span class="sourceLineNo">604</span>        "Address '%s' is not a 6to4 address.", toAddrString(ip));<a name="line.604"></a>
<span class="sourceLineNo">605</span><a name="line.605"></a>
<span class="sourceLineNo">606</span>    return getInet4Address(Arrays.copyOfRange(ip.getAddress(), 2, 6));<a name="line.606"></a>
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<span class="sourceLineNo">608</span><a name="line.608"></a>
<span class="sourceLineNo">609</span>  /**<a name="line.609"></a>
<span class="sourceLineNo">610</span>   * A simple immutable data class to encapsulate the information to be found in a<a name="line.610"></a>
<span class="sourceLineNo">611</span>   * Teredo address.<a name="line.611"></a>
<span class="sourceLineNo">612</span>   *<a name="line.612"></a>
<span class="sourceLineNo">613</span>   * &lt;p&gt;All of the fields in this class are encoded in various portions<a name="line.613"></a>
<span class="sourceLineNo">614</span>   * of the IPv6 address as part of the protocol.  More protocols details<a name="line.614"></a>
<span class="sourceLineNo">615</span>   * can be found at:<a name="line.615"></a>
<span class="sourceLineNo">616</span>   * &lt;a target="_parent" href="http://en.wikipedia.org/wiki/Teredo_tunneling"<a name="line.616"></a>
<span class="sourceLineNo">617</span>   *    &gt;http://en.wikipedia.org/wiki/Teredo_tunneling&lt;/a&gt;.<a name="line.617"></a>
<span class="sourceLineNo">618</span>   *<a name="line.618"></a>
<span class="sourceLineNo">619</span>   * &lt;p&gt;The RFC can be found here:<a name="line.619"></a>
<span class="sourceLineNo">620</span>   * &lt;a target="_parent" href="http://tools.ietf.org/html/rfc4380"<a name="line.620"></a>
<span class="sourceLineNo">621</span>   *    &gt;http://tools.ietf.org/html/rfc4380&lt;/a&gt;.<a name="line.621"></a>
<span class="sourceLineNo">622</span>   *<a name="line.622"></a>
<span class="sourceLineNo">623</span>   * @since 5.0<a name="line.623"></a>
<span class="sourceLineNo">624</span>   */<a name="line.624"></a>
<span class="sourceLineNo">625</span>  @Beta<a name="line.625"></a>
<span class="sourceLineNo">626</span>  public static final class TeredoInfo {<a name="line.626"></a>
<span class="sourceLineNo">627</span>    private final Inet4Address server;<a name="line.627"></a>
<span class="sourceLineNo">628</span>    private final Inet4Address client;<a name="line.628"></a>
<span class="sourceLineNo">629</span>    private final int port;<a name="line.629"></a>
<span class="sourceLineNo">630</span>    private final int flags;<a name="line.630"></a>
<span class="sourceLineNo">631</span><a name="line.631"></a>
<span class="sourceLineNo">632</span>    /**<a name="line.632"></a>
<span class="sourceLineNo">633</span>     * Constructs a TeredoInfo instance.<a name="line.633"></a>
<span class="sourceLineNo">634</span>     *<a name="line.634"></a>
<span class="sourceLineNo">635</span>     * &lt;p&gt;Both server and client can be {@code null}, in which case the<a name="line.635"></a>
<span class="sourceLineNo">636</span>     * value {@code "0.0.0.0"} will be assumed.<a name="line.636"></a>
<span class="sourceLineNo">637</span>     *<a name="line.637"></a>
<span class="sourceLineNo">638</span>     * @throws IllegalArgumentException if either of the {@code port} or the {@code flags}<a name="line.638"></a>
<span class="sourceLineNo">639</span>     *     arguments are out of range of an unsigned short<a name="line.639"></a>
<span class="sourceLineNo">640</span>     */<a name="line.640"></a>
<span class="sourceLineNo">641</span>    // TODO: why is this public?<a name="line.641"></a>
<span class="sourceLineNo">642</span>    public TeredoInfo(<a name="line.642"></a>
<span class="sourceLineNo">643</span>        @Nullable Inet4Address server, @Nullable Inet4Address client, int port, int flags) {<a name="line.643"></a>
<span class="sourceLineNo">644</span>      Preconditions.checkArgument((port &gt;= 0) &amp;&amp; (port &lt;= 0xffff),<a name="line.644"></a>
<span class="sourceLineNo">645</span>          "port '%s' is out of range (0 &lt;= port &lt;= 0xffff)", port);<a name="line.645"></a>
<span class="sourceLineNo">646</span>      Preconditions.checkArgument((flags &gt;= 0) &amp;&amp; (flags &lt;= 0xffff),<a name="line.646"></a>
<span class="sourceLineNo">647</span>          "flags '%s' is out of range (0 &lt;= flags &lt;= 0xffff)", flags);<a name="line.647"></a>
<span class="sourceLineNo">648</span>      <a name="line.648"></a>
<span class="sourceLineNo">649</span>      this.server = Objects.firstNonNull(server, ANY4);<a name="line.649"></a>
<span class="sourceLineNo">650</span>      this.client = Objects.firstNonNull(client, ANY4);<a name="line.650"></a>
<span class="sourceLineNo">651</span>      this.port = port;<a name="line.651"></a>
<span class="sourceLineNo">652</span>      this.flags = flags;<a name="line.652"></a>
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<span class="sourceLineNo">654</span><a name="line.654"></a>
<span class="sourceLineNo">655</span>    public Inet4Address getServer() {<a name="line.655"></a>
<span class="sourceLineNo">656</span>      return server;<a name="line.656"></a>
<span class="sourceLineNo">657</span>    }<a name="line.657"></a>
<span class="sourceLineNo">658</span><a name="line.658"></a>
<span class="sourceLineNo">659</span>    public Inet4Address getClient() {<a name="line.659"></a>
<span class="sourceLineNo">660</span>      return client;<a name="line.660"></a>
<span class="sourceLineNo">661</span>    }<a name="line.661"></a>
<span class="sourceLineNo">662</span><a name="line.662"></a>
<span class="sourceLineNo">663</span>    public int getPort() {<a name="line.663"></a>
<span class="sourceLineNo">664</span>      return port;<a name="line.664"></a>
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<span class="sourceLineNo">666</span><a name="line.666"></a>
<span class="sourceLineNo">667</span>    public int getFlags() {<a name="line.667"></a>
<span class="sourceLineNo">668</span>      return flags;<a name="line.668"></a>
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<span class="sourceLineNo">670</span>  }<a name="line.670"></a>
<span class="sourceLineNo">671</span><a name="line.671"></a>
<span class="sourceLineNo">672</span>  /**<a name="line.672"></a>
<span class="sourceLineNo">673</span>   * Evaluates whether the argument is a Teredo address.<a name="line.673"></a>
<span class="sourceLineNo">674</span>   *<a name="line.674"></a>
<span class="sourceLineNo">675</span>   * &lt;p&gt;Teredo addresses begin with the {@code "2001::/32"} prefix.<a name="line.675"></a>
<span class="sourceLineNo">676</span>   *<a name="line.676"></a>
<span class="sourceLineNo">677</span>   * @param ip {@link Inet6Address} to be examined for Teredo address format<a name="line.677"></a>
<span class="sourceLineNo">678</span>   * @return {@code true} if the argument is a Teredo address<a name="line.678"></a>
<span class="sourceLineNo">679</span>   */<a name="line.679"></a>
<span class="sourceLineNo">680</span>  public static boolean isTeredoAddress(Inet6Address ip) {<a name="line.680"></a>
<span class="sourceLineNo">681</span>    byte[] bytes = ip.getAddress();<a name="line.681"></a>
<span class="sourceLineNo">682</span>    return (bytes[0] == (byte) 0x20) &amp;&amp; (bytes[1] == (byte) 0x01)<a name="line.682"></a>
<span class="sourceLineNo">683</span>           &amp;&amp; (bytes[2] == 0) &amp;&amp; (bytes[3] == 0);<a name="line.683"></a>
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<span class="sourceLineNo">685</span><a name="line.685"></a>
<span class="sourceLineNo">686</span>  /**<a name="line.686"></a>
<span class="sourceLineNo">687</span>   * Returns the Teredo information embedded in a Teredo address.<a name="line.687"></a>
<span class="sourceLineNo">688</span>   *<a name="line.688"></a>
<span class="sourceLineNo">689</span>   * @param ip {@link Inet6Address} to be examined for embedded Teredo information<a name="line.689"></a>
<span class="sourceLineNo">690</span>   * @return extracted {@code TeredoInfo}<a name="line.690"></a>
<span class="sourceLineNo">691</span>   * @throws IllegalArgumentException if the argument is not a valid IPv6 Teredo address<a name="line.691"></a>
<span class="sourceLineNo">692</span>   */<a name="line.692"></a>
<span class="sourceLineNo">693</span>  public static TeredoInfo getTeredoInfo(Inet6Address ip) {<a name="line.693"></a>
<span class="sourceLineNo">694</span>    Preconditions.checkArgument(isTeredoAddress(ip),<a name="line.694"></a>
<span class="sourceLineNo">695</span>        "Address '%s' is not a Teredo address.", toAddrString(ip));<a name="line.695"></a>
<span class="sourceLineNo">696</span><a name="line.696"></a>
<span class="sourceLineNo">697</span>    byte[] bytes = ip.getAddress();<a name="line.697"></a>
<span class="sourceLineNo">698</span>    Inet4Address server = getInet4Address(Arrays.copyOfRange(bytes, 4, 8));<a name="line.698"></a>
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<span class="sourceLineNo">701</span><a name="line.701"></a>
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<span class="sourceLineNo">704</span><a name="line.704"></a>
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<span class="sourceLineNo">707</span>      // Teredo obfuscates the mapped client IP, per section 4 of the RFC.<a name="line.707"></a>
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<span class="sourceLineNo">714</span><a name="line.714"></a>
<span class="sourceLineNo">715</span>  /**<a name="line.715"></a>
<span class="sourceLineNo">716</span>   * Evaluates whether the argument is an ISATAP address.<a name="line.716"></a>
<span class="sourceLineNo">717</span>   *<a name="line.717"></a>
<span class="sourceLineNo">718</span>   * &lt;p&gt;From RFC 5214: "ISATAP interface identifiers are constructed in<a name="line.718"></a>
<span class="sourceLineNo">719</span>   * Modified EUI-64 format [...] by concatenating the 24-bit IANA OUI<a name="line.719"></a>
<span class="sourceLineNo">720</span>   * (00-00-5E), the 8-bit hexadecimal value 0xFE, and a 32-bit IPv4<a name="line.720"></a>
<span class="sourceLineNo">721</span>   * address in network byte order [...]"<a name="line.721"></a>
<span class="sourceLineNo">722</span>   *<a name="line.722"></a>
<span class="sourceLineNo">723</span>   * &lt;p&gt;For more on ISATAP addresses see section 6.1 of<a name="line.723"></a>
<span class="sourceLineNo">724</span>   * &lt;a target="_parent" href="http://tools.ietf.org/html/rfc5214#section-6.1"<a name="line.724"></a>
<span class="sourceLineNo">725</span>   *    &gt;http://tools.ietf.org/html/rfc5214&lt;/a&gt;<a name="line.725"></a>
<span class="sourceLineNo">726</span>   *<a name="line.726"></a>
<span class="sourceLineNo">727</span>   * @param ip {@link Inet6Address} to be examined for ISATAP address format<a name="line.727"></a>
<span class="sourceLineNo">728</span>   * @return {@code true} if the argument is an ISATAP address<a name="line.728"></a>
<span class="sourceLineNo">729</span>   */<a name="line.729"></a>
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<span class="sourceLineNo">731</span><a name="line.731"></a>
<span class="sourceLineNo">732</span>    // If it's a Teredo address with the right port (41217, or 0xa101)<a name="line.732"></a>
<span class="sourceLineNo">733</span>    // which would be encoded as 0x5efe then it can't be an ISATAP address.<a name="line.733"></a>
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<span class="sourceLineNo">741</span><a name="line.741"></a>
<span class="sourceLineNo">742</span>      // Verify that high byte of the 64 bit identifier is zero, modulo<a name="line.742"></a>
<span class="sourceLineNo">743</span>      // the U/L and G bits, with which we are not concerned.<a name="line.743"></a>
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<span class="sourceLineNo">747</span>    return (bytes[9] == (byte) 0x00) &amp;&amp; (bytes[10] == (byte) 0x5e)<a name="line.747"></a>
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<span class="sourceLineNo">750</span><a name="line.750"></a>
<span class="sourceLineNo">751</span>  /**<a name="line.751"></a>
<span class="sourceLineNo">752</span>   * Returns the IPv4 address embedded in an ISATAP address.<a name="line.752"></a>
<span class="sourceLineNo">753</span>   *<a name="line.753"></a>
<span class="sourceLineNo">754</span>   * @param ip {@link Inet6Address} to be examined for embedded IPv4 in ISATAP address<a name="line.754"></a>
<span class="sourceLineNo">755</span>   * @return {@link Inet4Address} of embedded IPv4 in an ISATAP address<a name="line.755"></a>
<span class="sourceLineNo">756</span>   * @throws IllegalArgumentException if the argument is not a valid IPv6 ISATAP address<a name="line.756"></a>
<span class="sourceLineNo">757</span>   */<a name="line.757"></a>
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<span class="sourceLineNo">760</span>        "Address '%s' is not an ISATAP address.", toAddrString(ip));<a name="line.760"></a>
<span class="sourceLineNo">761</span><a name="line.761"></a>
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<span class="sourceLineNo">764</span><a name="line.764"></a>
<span class="sourceLineNo">765</span>  /**<a name="line.765"></a>
<span class="sourceLineNo">766</span>   * Examines the Inet6Address to determine if it is an IPv6 address of one<a name="line.766"></a>
<span class="sourceLineNo">767</span>   * of the specified address types that contain an embedded IPv4 address.<a name="line.767"></a>
<span class="sourceLineNo">768</span>   *<a name="line.768"></a>
<span class="sourceLineNo">769</span>   * &lt;p&gt;NOTE: ISATAP addresses are explicitly excluded from this method<a name="line.769"></a>
<span class="sourceLineNo">770</span>   * due to their trivial spoofability.  With other transition addresses<a name="line.770"></a>
<span class="sourceLineNo">771</span>   * spoofing involves (at least) infection of one's BGP routing table.<a name="line.771"></a>
<span class="sourceLineNo">772</span>   *<a name="line.772"></a>
<span class="sourceLineNo">773</span>   * @param ip {@link Inet6Address} to be examined for embedded IPv4 client address<a name="line.773"></a>
<span class="sourceLineNo">774</span>   * @return {@code true} if there is an embedded IPv4 client address<a name="line.774"></a>
<span class="sourceLineNo">775</span>   * @since 7.0<a name="line.775"></a>
<span class="sourceLineNo">776</span>   */<a name="line.776"></a>
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<span class="sourceLineNo">778</span>    return isCompatIPv4Address(ip) || is6to4Address(ip) || isTeredoAddress(ip);<a name="line.778"></a>
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<span class="sourceLineNo">780</span><a name="line.780"></a>
<span class="sourceLineNo">781</span>  /**<a name="line.781"></a>
<span class="sourceLineNo">782</span>   * Examines the Inet6Address to extract the embedded IPv4 client address<a name="line.782"></a>
<span class="sourceLineNo">783</span>   * if the InetAddress is an IPv6 address of one of the specified address<a name="line.783"></a>
<span class="sourceLineNo">784</span>   * types that contain an embedded IPv4 address.<a name="line.784"></a>
<span class="sourceLineNo">785</span>   *<a name="line.785"></a>
<span class="sourceLineNo">786</span>   * &lt;p&gt;NOTE: ISATAP addresses are explicitly excluded from this method<a name="line.786"></a>
<span class="sourceLineNo">787</span>   * due to their trivial spoofability.  With other transition addresses<a name="line.787"></a>
<span class="sourceLineNo">788</span>   * spoofing involves (at least) infection of one's BGP routing table.<a name="line.788"></a>
<span class="sourceLineNo">789</span>   *<a name="line.789"></a>
<span class="sourceLineNo">790</span>   * @param ip {@link Inet6Address} to be examined for embedded IPv4 client address<a name="line.790"></a>
<span class="sourceLineNo">791</span>   * @return {@link Inet4Address} of embedded IPv4 client address<a name="line.791"></a>
<span class="sourceLineNo">792</span>   * @throws IllegalArgumentException if the argument does not have a valid embedded IPv4 address<a name="line.792"></a>
<span class="sourceLineNo">793</span>   */<a name="line.793"></a>
<span class="sourceLineNo">794</span>  public static Inet4Address getEmbeddedIPv4ClientAddress(Inet6Address ip) {<a name="line.794"></a>
<span class="sourceLineNo">795</span>    if (isCompatIPv4Address(ip)) {<a name="line.795"></a>
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<span class="sourceLineNo">798</span><a name="line.798"></a>
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<span class="sourceLineNo">803</span>    if (isTeredoAddress(ip)) {<a name="line.803"></a>
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<span class="sourceLineNo">806</span><a name="line.806"></a>
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<span class="sourceLineNo">808</span>        String.format("'%s' has no embedded IPv4 address.", toAddrString(ip)));<a name="line.808"></a>
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<span class="sourceLineNo">810</span><a name="line.810"></a>
<span class="sourceLineNo">811</span>  /**<a name="line.811"></a>
<span class="sourceLineNo">812</span>   * Evaluates whether the argument is an "IPv4 mapped" IPv6 address.<a name="line.812"></a>
<span class="sourceLineNo">813</span>   *<a name="line.813"></a>
<span class="sourceLineNo">814</span>   * &lt;p&gt;An "IPv4 mapped" address is anything in the range ::ffff:0:0/96<a name="line.814"></a>
<span class="sourceLineNo">815</span>   * (sometimes written as ::ffff:0.0.0.0/96), with the last 32 bits<a name="line.815"></a>
<span class="sourceLineNo">816</span>   * interpreted as an IPv4 address.<a name="line.816"></a>
<span class="sourceLineNo">817</span>   *<a name="line.817"></a>
<span class="sourceLineNo">818</span>   * &lt;p&gt;For more on IPv4 mapped addresses see section 2.5.5.2 of<a name="line.818"></a>
<span class="sourceLineNo">819</span>   * &lt;a target="_parent"<a name="line.819"></a>
<span class="sourceLineNo">820</span>   *    href="http://tools.ietf.org/html/rfc4291#section-2.5.5.2"<a name="line.820"></a>
<span class="sourceLineNo">821</span>   *    &gt;http://tools.ietf.org/html/rfc4291&lt;/a&gt;<a name="line.821"></a>
<span class="sourceLineNo">822</span>   *<a name="line.822"></a>
<span class="sourceLineNo">823</span>   * &lt;p&gt;Note: This method takes a {@code String} argument because<a name="line.823"></a>
<span class="sourceLineNo">824</span>   * {@link InetAddress} automatically collapses mapped addresses to IPv4.<a name="line.824"></a>
<span class="sourceLineNo">825</span>   * (It is actually possible to avoid this using one of the obscure<a name="line.825"></a>
<span class="sourceLineNo">826</span>   * {@link Inet6Address} methods, but it would be unwise to depend on such<a name="line.826"></a>
<span class="sourceLineNo">827</span>   * a poorly-documented feature.)<a name="line.827"></a>
<span class="sourceLineNo">828</span>   *<a name="line.828"></a>
<span class="sourceLineNo">829</span>   * @param ipString {@code String} to be examined for embedded IPv4-mapped IPv6 address format<a name="line.829"></a>
<span class="sourceLineNo">830</span>   * @return {@code true} if the argument is a valid "mapped" address<a name="line.830"></a>
<span class="sourceLineNo">831</span>   * @since 10.0<a name="line.831"></a>
<span class="sourceLineNo">832</span>   */<a name="line.832"></a>
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<span class="sourceLineNo">834</span>    byte[] bytes = ipStringToBytes(ipString);<a name="line.834"></a>
<span class="sourceLineNo">835</span>    if (bytes != null &amp;&amp; bytes.length == 16) {<a name="line.835"></a>
<span class="sourceLineNo">836</span>      for (int i = 0; i &lt; 10; i++) {<a name="line.836"></a>
<span class="sourceLineNo">837</span>        if (bytes[i] != 0) {<a name="line.837"></a>
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<span class="sourceLineNo">841</span>      for (int i = 10; i &lt; 12; i++) {<a name="line.841"></a>
<span class="sourceLineNo">842</span>        if (bytes[i] != (byte) 0xff) {<a name="line.842"></a>
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<span class="sourceLineNo">850</span><a name="line.850"></a>
<span class="sourceLineNo">851</span>  /**<a name="line.851"></a>
<span class="sourceLineNo">852</span>   * Coerces an IPv6 address into an IPv4 address.<a name="line.852"></a>
<span class="sourceLineNo">853</span>   *<a name="line.853"></a>
<span class="sourceLineNo">854</span>   * &lt;p&gt;HACK: As long as applications continue to use IPv4 addresses for<a name="line.854"></a>
<span class="sourceLineNo">855</span>   * indexing into tables, accounting, et cetera, it may be necessary to<a name="line.855"></a>
<span class="sourceLineNo">856</span>   * &lt;b&gt;coerce&lt;/b&gt; IPv6 addresses into IPv4 addresses. This function does<a name="line.856"></a>
<span class="sourceLineNo">857</span>   * so by hashing the upper 64 bits into {@code 224.0.0.0/3}<a name="line.857"></a>
<span class="sourceLineNo">858</span>   * (64 bits into 29 bits).<a name="line.858"></a>
<span class="sourceLineNo">859</span>   *<a name="line.859"></a>
<span class="sourceLineNo">860</span>   * &lt;p&gt;A "coerced" IPv4 address is equivalent to itself.<a name="line.860"></a>
<span class="sourceLineNo">861</span>   *<a name="line.861"></a>
<span class="sourceLineNo">862</span>   * &lt;p&gt;NOTE: This function is failsafe for security purposes: ALL IPv6<a name="line.862"></a>
<span class="sourceLineNo">863</span>   * addresses (except localhost (::1)) are hashed to avoid the security<a name="line.863"></a>
<span class="sourceLineNo">864</span>   * risk associated with extracting an embedded IPv4 address that might<a name="line.864"></a>
<span class="sourceLineNo">865</span>   * permit elevated privileges.<a name="line.865"></a>
<span class="sourceLineNo">866</span>   *<a name="line.866"></a>
<span class="sourceLineNo">867</span>   * @param ip {@link InetAddress} to "coerce"<a name="line.867"></a>
<span class="sourceLineNo">868</span>   * @return {@link Inet4Address} represented "coerced" address<a name="line.868"></a>
<span class="sourceLineNo">869</span>   * @since 7.0<a name="line.869"></a>
<span class="sourceLineNo">870</span>   */<a name="line.870"></a>
<span class="sourceLineNo">871</span>  public static Inet4Address getCoercedIPv4Address(InetAddress ip) {<a name="line.871"></a>
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<span class="sourceLineNo">875</span><a name="line.875"></a>
<span class="sourceLineNo">876</span>    // Special cases:<a name="line.876"></a>
<span class="sourceLineNo">877</span>    byte[] bytes = ip.getAddress();<a name="line.877"></a>
<span class="sourceLineNo">878</span>    boolean leadingBytesOfZero = true;<a name="line.878"></a>
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<span class="sourceLineNo">880</span>      if (bytes[i] != 0) {<a name="line.880"></a>
<span class="sourceLineNo">881</span>        leadingBytesOfZero = false;<a name="line.881"></a>
<span class="sourceLineNo">882</span>        break;<a name="line.882"></a>
<span class="sourceLineNo">883</span>      }<a name="line.883"></a>
<span class="sourceLineNo">884</span>    }<a name="line.884"></a>
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<span class="sourceLineNo">886</span>      return LOOPBACK4;  // ::1<a name="line.886"></a>
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<span class="sourceLineNo">888</span>      return ANY4;  // ::0<a name="line.888"></a>
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<span class="sourceLineNo">891</span>    Inet6Address ip6 = (Inet6Address) ip;<a name="line.891"></a>
<span class="sourceLineNo">892</span>    long addressAsLong = 0;<a name="line.892"></a>
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<span class="sourceLineNo">894</span>      addressAsLong = getEmbeddedIPv4ClientAddress(ip6).hashCode();<a name="line.894"></a>
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<span class="sourceLineNo">896</span><a name="line.896"></a>
<span class="sourceLineNo">897</span>      // Just extract the high 64 bits (assuming the rest is user-modifiable).<a name="line.897"></a>
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<span class="sourceLineNo">900</span><a name="line.900"></a>
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<span class="sourceLineNo">902</span>    int coercedHash = Hashing.murmur3_32().hashLong(addressAsLong).asInt();<a name="line.902"></a>
<span class="sourceLineNo">903</span><a name="line.903"></a>
<span class="sourceLineNo">904</span>    // Squash into 224/4 Multicast and 240/4 Reserved space (i.e. 224/3).<a name="line.904"></a>
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<span class="sourceLineNo">906</span><a name="line.906"></a>
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<span class="sourceLineNo">908</span>    // illegal value is 255.255.255.255.<a name="line.908"></a>
<span class="sourceLineNo">909</span>    if (coercedHash == 0xffffffff) {<a name="line.909"></a>
<span class="sourceLineNo">910</span>      coercedHash = 0xfffffffe;<a name="line.910"></a>
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<span class="sourceLineNo">913</span>    return getInet4Address(Ints.toByteArray(coercedHash));<a name="line.913"></a>
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<span class="sourceLineNo">915</span><a name="line.915"></a>
<span class="sourceLineNo">916</span>  /**<a name="line.916"></a>
<span class="sourceLineNo">917</span>   * Returns an integer representing an IPv4 address regardless of<a name="line.917"></a>
<span class="sourceLineNo">918</span>   * whether the supplied argument is an IPv4 address or not.<a name="line.918"></a>
<span class="sourceLineNo">919</span>   *<a name="line.919"></a>
<span class="sourceLineNo">920</span>   * &lt;p&gt;IPv6 addresses are &lt;b&gt;coerced&lt;/b&gt; to IPv4 addresses before being<a name="line.920"></a>
<span class="sourceLineNo">921</span>   * converted to integers.<a name="line.921"></a>
<span class="sourceLineNo">922</span>   *<a name="line.922"></a>
<span class="sourceLineNo">923</span>   * &lt;p&gt;As long as there are applications that assume that all IP addresses<a name="line.923"></a>
<span class="sourceLineNo">924</span>   * are IPv4 addresses and can therefore be converted safely to integers<a name="line.924"></a>
<span class="sourceLineNo">925</span>   * (for whatever purpose) this function can be used to handle IPv6<a name="line.925"></a>
<span class="sourceLineNo">926</span>   * addresses as well until the application is suitably fixed.<a name="line.926"></a>
<span class="sourceLineNo">927</span>   *<a name="line.927"></a>
<span class="sourceLineNo">928</span>   * &lt;p&gt;NOTE: an IPv6 address coerced to an IPv4 address can only be used<a name="line.928"></a>
<span class="sourceLineNo">929</span>   * for such purposes as rudimentary identification or indexing into a<a name="line.929"></a>
<span class="sourceLineNo">930</span>   * collection of real {@link InetAddress}es.  They cannot be used as<a name="line.930"></a>
<span class="sourceLineNo">931</span>   * real addresses for the purposes of network communication.<a name="line.931"></a>
<span class="sourceLineNo">932</span>   *<a name="line.932"></a>
<span class="sourceLineNo">933</span>   * @param ip {@link InetAddress} to convert<a name="line.933"></a>
<span class="sourceLineNo">934</span>   * @return {@code int}, "coerced" if ip is not an IPv4 address<a name="line.934"></a>
<span class="sourceLineNo">935</span>   * @since 7.0<a name="line.935"></a>
<span class="sourceLineNo">936</span>   */<a name="line.936"></a>
<span class="sourceLineNo">937</span>  public static int coerceToInteger(InetAddress ip) {<a name="line.937"></a>
<span class="sourceLineNo">938</span>    return ByteStreams.newDataInput(getCoercedIPv4Address(ip).getAddress()).readInt();<a name="line.938"></a>
<span class="sourceLineNo">939</span>  }<a name="line.939"></a>
<span class="sourceLineNo">940</span><a name="line.940"></a>
<span class="sourceLineNo">941</span>  /**<a name="line.941"></a>
<span class="sourceLineNo">942</span>   * Returns an Inet4Address having the integer value specified by<a name="line.942"></a>
<span class="sourceLineNo">943</span>   * the argument.<a name="line.943"></a>
<span class="sourceLineNo">944</span>   *<a name="line.944"></a>
<span class="sourceLineNo">945</span>   * @param address {@code int}, the 32bit integer address to be converted<a name="line.945"></a>
<span class="sourceLineNo">946</span>   * @return {@link Inet4Address} equivalent of the argument<a name="line.946"></a>
<span class="sourceLineNo">947</span>   */<a name="line.947"></a>
<span class="sourceLineNo">948</span>  public static Inet4Address fromInteger(int address) {<a name="line.948"></a>
<span class="sourceLineNo">949</span>    return getInet4Address(Ints.toByteArray(address));<a name="line.949"></a>
<span class="sourceLineNo">950</span>  }<a name="line.950"></a>
<span class="sourceLineNo">951</span><a name="line.951"></a>
<span class="sourceLineNo">952</span>  /**<a name="line.952"></a>
<span class="sourceLineNo">953</span>   * Returns an address from a &lt;b&gt;little-endian ordered&lt;/b&gt; byte array<a name="line.953"></a>
<span class="sourceLineNo">954</span>   * (the opposite of what {@link InetAddress#getByAddress} expects).<a name="line.954"></a>
<span class="sourceLineNo">955</span>   *<a name="line.955"></a>
<span class="sourceLineNo">956</span>   * &lt;p&gt;IPv4 address byte array must be 4 bytes long and IPv6 byte array<a name="line.956"></a>
<span class="sourceLineNo">957</span>   * must be 16 bytes long.<a name="line.957"></a>
<span class="sourceLineNo">958</span>   *<a name="line.958"></a>
<span class="sourceLineNo">959</span>   * @param addr the raw IP address in little-endian byte order<a name="line.959"></a>
<span class="sourceLineNo">960</span>   * @return an InetAddress object created from the raw IP address<a name="line.960"></a>
<span class="sourceLineNo">961</span>   * @throws UnknownHostException if IP address is of illegal length<a name="line.961"></a>
<span class="sourceLineNo">962</span>   */<a name="line.962"></a>
<span class="sourceLineNo">963</span>  public static InetAddress fromLittleEndianByteArray(byte[] addr) throws UnknownHostException {<a name="line.963"></a>
<span class="sourceLineNo">964</span>    byte[] reversed = new byte[addr.length];<a name="line.964"></a>
<span class="sourceLineNo">965</span>    for (int i = 0; i &lt; addr.length; i++) {<a name="line.965"></a>
<span class="sourceLineNo">966</span>      reversed[i] = addr[addr.length - i - 1];<a name="line.966"></a>
<span class="sourceLineNo">967</span>    }<a name="line.967"></a>
<span class="sourceLineNo">968</span>    return InetAddress.getByAddress(reversed);<a name="line.968"></a>
<span class="sourceLineNo">969</span>  }<a name="line.969"></a>
<span class="sourceLineNo">970</span><a name="line.970"></a>
<span class="sourceLineNo">971</span>  /**<a name="line.971"></a>
<span class="sourceLineNo">972</span>   * Returns a new InetAddress that is one more than the passed in address.<a name="line.972"></a>
<span class="sourceLineNo">973</span>   * This method works for both IPv4 and IPv6 addresses.<a name="line.973"></a>
<span class="sourceLineNo">974</span>   *<a name="line.974"></a>
<span class="sourceLineNo">975</span>   * @param address the InetAddress to increment<a name="line.975"></a>
<span class="sourceLineNo">976</span>   * @return a new InetAddress that is one more than the passed in address<a name="line.976"></a>
<span class="sourceLineNo">977</span>   * @throws IllegalArgumentException if InetAddress is at the end of its range<a name="line.977"></a>
<span class="sourceLineNo">978</span>   * @since 10.0<a name="line.978"></a>
<span class="sourceLineNo">979</span>   */<a name="line.979"></a>
<span class="sourceLineNo">980</span>  public static InetAddress increment(InetAddress address) {<a name="line.980"></a>
<span class="sourceLineNo">981</span>    byte[] addr = address.getAddress();<a name="line.981"></a>
<span class="sourceLineNo">982</span>    int i = addr.length - 1;<a name="line.982"></a>
<span class="sourceLineNo">983</span>    while (i &gt;= 0 &amp;&amp; addr[i] == (byte) 0xff) {<a name="line.983"></a>
<span class="sourceLineNo">984</span>      addr[i] = 0;<a name="line.984"></a>
<span class="sourceLineNo">985</span>      i--;<a name="line.985"></a>
<span class="sourceLineNo">986</span>    }<a name="line.986"></a>
<span class="sourceLineNo">987</span><a name="line.987"></a>
<span class="sourceLineNo">988</span>    Preconditions.checkArgument(i &gt;= 0, "Incrementing %s would wrap.", address);<a name="line.988"></a>
<span class="sourceLineNo">989</span><a name="line.989"></a>
<span class="sourceLineNo">990</span>    addr[i]++;<a name="line.990"></a>
<span class="sourceLineNo">991</span>    return bytesToInetAddress(addr);<a name="line.991"></a>
<span class="sourceLineNo">992</span>  }<a name="line.992"></a>
<span class="sourceLineNo">993</span><a name="line.993"></a>
<span class="sourceLineNo">994</span>  /**<a name="line.994"></a>
<span class="sourceLineNo">995</span>   * Returns true if the InetAddress is either 255.255.255.255 for IPv4 or<a name="line.995"></a>
<span class="sourceLineNo">996</span>   * ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff for IPv6.<a name="line.996"></a>
<span class="sourceLineNo">997</span>   *<a name="line.997"></a>
<span class="sourceLineNo">998</span>   * @return true if the InetAddress is either 255.255.255.255 for IPv4 or<a name="line.998"></a>
<span class="sourceLineNo">999</span>   *     ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff for IPv6<a name="line.999"></a>
<span class="sourceLineNo">1000</span>   * @since 10.0<a name="line.1000"></a>
<span class="sourceLineNo">1001</span>   */<a name="line.1001"></a>
<span class="sourceLineNo">1002</span>  public static boolean isMaximum(InetAddress address) {<a name="line.1002"></a>
<span class="sourceLineNo">1003</span>    byte[] addr = address.getAddress();<a name="line.1003"></a>
<span class="sourceLineNo">1004</span>    for (int i = 0; i &lt; addr.length; i++) {<a name="line.1004"></a>
<span class="sourceLineNo">1005</span>      if (addr[i] != (byte) 0xff) {<a name="line.1005"></a>
<span class="sourceLineNo">1006</span>        return false;<a name="line.1006"></a>
<span class="sourceLineNo">1007</span>      }<a name="line.1007"></a>
<span class="sourceLineNo">1008</span>    }<a name="line.1008"></a>
<span class="sourceLineNo">1009</span>    return true;<a name="line.1009"></a>
<span class="sourceLineNo">1010</span>  }<a name="line.1010"></a>
<span class="sourceLineNo">1011</span>}<a name="line.1011"></a>




























































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